e1000: Force full DMA clocking for 10/100 speed

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/net/e1000/e1000_hw.c b/drivers/net/e1000/e1000_hw.c
index 3728f33045c3..8eddfdf62f55 100644
--- a/drivers/net/e1000/e1000_hw.c
+++ b/drivers/net/e1000/e1000_hw.c
@@ -718,6 +718,17 @@ e1000_init_hw(struct e1000_hw *hw)
 
     DEBUGFUNC("e1000_init_hw");
 
+    /* force full DMA clock frequency for 10/100 on ICH8 A0-B0 */
+    if (hw->mac_type == e1000_ich8lan) {
+        reg_data = E1000_READ_REG(hw, TARC0);
+        reg_data |= 0x30000000;
+        E1000_WRITE_REG(hw, TARC0, reg_data);
+
+        reg_data = E1000_READ_REG(hw, STATUS);
+        reg_data &= ~0x80000000;
+        E1000_WRITE_REG(hw, STATUS, reg_data);
+    }
+
     /* Initialize Identification LED */
     ret_val = e1000_id_led_init(hw);
     if(ret_val) {